NOTE: As their name suggests hints are not exactly Dishonored cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Dishonored even more entertaining.

Alive Without Breath (Bronze): You took possession of a fish
An Unfortunate Accident (Bronze): You killed Morgan Pendleton with steam
Art Dealer (Silver): You collected all the Sokolov paintings
Back Home (Bronze): You grabbed a live grenade and threw it back, killing an attacker
Big Boy (Bronze): You killed a tallboy using only your sword
Bodyguard (Bronze): You protected Callista's uncle, Captain Geoff Curnow
Capturing Genius and Madness (Bronze): You abducted Anton Sokolov, Royal Physician
Child Care (Bronze): You located Lady Emily Kaldwin, heir to the throne
Clean Hands (Gold): You completed the game without killing anyone
Cleaner (Bronze): You fought 5 enemies at once and none of them survived
Creepy Crawly (Bronze): You used a rat tunnel
Dishonored (Bronze): You escaped Coldridge Prison
Dunwall in Chaos (Bronze): You completed the game in high chaos
Excommunication (Bronze): You eliminated High Overseer Campbell
Faceless (Bronze): After escaping Coldridge Prison, you completed a mission without alerting anyone
Food Chain (Bronze): You assassinated an assassin
Gentleman Caller (Bronze): You completed all the Granny Rags side missionsGhost (Silver): You completed all missions after the prologue, alerting or killing no one but key targets
Harm's Way (Bronze): You caused 5 unintentional suicides
Hornets' Nest (Bronze): You killed 4 enemies in less than 1 second using the crossbow
Inhabitant (Bronze): You stayed in possession of others for most of a 3 minute period
Just Dark Enough (Bronze): You completed the game in low chaos
King of the World (Bronze): You reached the top of Kaldwin's Bridge
Lights Out (Bronze): You deactivated at least 5 security systems on Kingsparrow Island
Long Live the Empress (Bronze): You saved Empress Emily Kaldwin
Manipulator (Bronze): You made others kill 5 of their own allies
Merchant of Disorder (Bronze): You acquired 15 equipment upgrades
Mercy is the Mark (Bronze): You spared Daud's life
Mostly Flesh and Steel (Silver): You finished the game without purchasing any supernatural powers or enhancements, besides Blink
Occultist (Bronze): You collected 10 bone charms
Platinum Blades and Dark Corners (Platinum): You have mastered the City of Dunwall and unlocked all Trophies
Poetic Justice (Gold): You neutralized all key targets using indirect means
Political Suicide (Bronze): You brought about the Lord Regent's fall from grace by broadcasting his crimes
Razor Rain (Bronze): You killed 5 characters with Drop Assassination
Regicide (Bronze): You assassinated the Lord Regent, Hiram Burrows
Resolution (Gold): You completed the game
Rogue (Bronze): You assassinated 10 unaware enemies
Shadow (Silver): You completed all missions after the prologue without alerting anyone
Specter (Bronze): After escaping prison, you completed a mission, not alerting anyone and killing less than 5 people
Speed of Darkness (Bronze): You traveled 30 meters in less than 1 second
Street Conspiracy (Bronze): You completed all the Slackjaw side missions
Surgical (Silver): You played from the first mission through Kaldwin's Bridge killing fewer than 10 characters
Tempest (Bronze): You killed 6 enemies in less than 1 second
The Art of the Steal (Bronze): You got the Art Dealer's safe combination for Slackjaw, but robbed the safe first
The Escapist (Bronze): After Coldridge Prison, you eluded 5 pursuers at once without killing them or leaving the map
Thief (Bronze): You pickpocketed items worth a total of 200 coins
This is Mine (Bronze): You recovered your belongings
Vanished (Bronze): You escaped prison and navigated the sewers undetected
Versatile (Bronze): You killed characters with each weapon and offensive gadget
Wall of Sparks (Bronze): You killed an enemy with the Wall of Light
Well Mannered (Bronze): You completed the Boyle Estate mission without spoiling the party

Assassin Vs. Machine (Bronze): You completed Train Runner before the train arrives at the station
By My Hand Alone (Bronze): You made it to Wave 13 in Back Alley Brawl killing all combatants personally
Daredevil (Bronze): In Bonfires, you performed all the special combination jumps in 1 round
Headhunter (Bronze): You completed Assassin's Run with 100% accuracy using only head shots
Long Way Down (Bronze): You performed a drop assassination of at least 150 meters in the Kill Cascade challenge
Mrs. Pilsen's Remorse (Silver): You found Emily's doll hidden in each of the 10 challenges
Natural Talent (Bronze): You finished Mystery Foe without using any active supernatural powers
Rare Collector (Bronze): You found all of the collectable figurines in the Burglar on Expert
Time Management (Bronze): You finished Chain Kill or Bend Time Massacre without failing any wave, including bonuses
Void Star (Silver): You completed all Normal and Expert challenges with a 3-Stars rating

Dishonored: The Knife of Dunwall Trophies
There are 7 Bronze Trophies and 3 Silver Trophies.: Type
Cleaner Hands (Bronze): You completed The Knife of Dunwall without killing anyone
Just Business (Bronze): You got the information needed from the Rothwild Slaughterhouse
Message from the Empress (Bronze): You performed a drop assassination from atop the Empress statue
Missing Pieces (Bronze): You obtained Delilah Copperspoon's identity from Thalia Timish
No Regrets (Silver): You completed The Knife of Dunwall in High Chaos
Rats and Ashes (Bronze): You caused a death using an arc mine and a rat
Redemptive Path (Silver): You completed The Knife of Dunwall in Low Chaos
Stone Cold Heart (Bronze): You spoke with the statue of Delilah in Timsh's estate
Well Connected (Bronze): You purchased all of the Favors in The Knife of Dunwall
Whisper Ways (Silver): You completed The Knife of Dunwall without alerting anyone